For a highway bridge over a railroad, the governing regulation is Â§646.214(a)(2), The State transportation agency should follow its normal specifications, design standards, and guidelines for Federal-aid highway projects.
Pregnancy in dogs typically lasts 63 days (about nine weeks). The duration of a dog's pregnancy can fall in the range of 58 to 68 days.Though estrus (heat cycles) can vary from breed to breed, the normal gestation period falls within the same range for all dogs, regardless of breed.1  Most dogs will show no signs of pregnancy in the first several weeks.ow Long is a Dog's Pregnancy? Pregnancy in dogs typically lasts 63 days (about nine weeks). The duration of a dog's pregnancy can fall in the range of 58 to 68 days. Though estrus (heat cycles) can vary from breed to breed, the normal gestation period falls within the same range for all dogs, regardless of breed.
Gestation is the term used to describe the time from ovulation to birth. It is important for breeders and dog owners interested in having puppies to note that ovulation period may not be the same as the breeding period. For a normal dog, the period of gestation is between 56 to 66 days with the average falling at 63 days. The veterinarian can confirm pregnancy by ultrasound as early as the 18th day after ovulation. The initial stages of dog pregnancy are marked by few changes.